LeaVerou/prefixfreeArchived
Prefixfree
prefixfree is a runtime CSS processor and polyfill library designed to ensure cross-browser visual consistency. It functions as a client-side script that automatically detects browser requirements and injects necessary vendor prefixes into CSS properties and values at runtime.
The project utilizes a system that intercepts stylesheets and modifies style rules in browser memory. It includes a DOM mutation style monitor that observes the document tree for new elements to apply prefixing logic to dynamic content and attributes.
The library provides polyfilling for modern CSS standards in legacy environments, specifically resolving CSS custom properties into computed values and calculating viewport-relative units during resize events. It also standardizes style property names across different browser engines and can add browser-specific classes to the root element for conditional styling.
Features
- CSS Vendor Prefix Normalizers - Automatically detects browser requirements and injects necessary vendor prefixes into CSS properties at runtime.
- Runtime CSS Interceptors - Intercepts the browser style loading process to parse and rewrite CSS rules in memory before they are applied.
- CSS Polyfill Engines - Calculates and updates layout-dependent CSS values in real time to provide support for modern standards.
- CSS Variable Resolution - Replaces CSS custom properties with computed values and applies necessary vendor prefixes.
- Resize-Driven Polyfills - Dynamically recalculates and updates layout-dependent CSS values in response to browser resize events.
- Cross-Browser Layout Consistency - Ensures consistent visual rendering across different browsers by automatically applying necessary vendor prefixes.
- Style Sheet Injection - Monitors the document for new elements to apply prefixing logic to content added after page load.
- Style Loading Interception - Hooks into the browser style loading process to parse and rewrite CSS rules before application.
- Runtime Mutation Engines - Intercepts stylesheets and modifies style rules in browser memory to ensure cross-browser rendering consistency.
- DOM Mutation Observation - Monitors the document for structural changes to apply prefixing logic to new elements.
- Dynamic Input Styling - Detects new elements in the DOM to automatically apply prefixing logic to dynamic content.
- Feature Detection Polyfills - Detects browser capabilities at runtime to determine which vendor prefixes must be injected.
- Vendor Prefix Managers - Injects browser-specific prefixes into unprefixed CSS properties and selectors at runtime.
- CSS Variable Polyfills - Replaces custom CSS variables with declared values and applies vendor prefixes where native support is missing.
- Processing Callbacks - Provides hooks for registering custom logic to intercept and modify style definitions during automated processing.
- Viewport Unit Calculators - Calculates and updates layout-dependent pixel values for viewport-relative units during browser resize events.
- Legacy Browser Support - Maintains modern design standards in older browsers by polyfilling viewport units and standardizing properties.
- CSS Polyfills - Automatically adds vendor prefixes to CSS properties.
- Polyfills and Compatibility - Automatically adds vendor prefixes to CSS.
